Characterizing Antioxidant Potential of Alcoholic Extracts of Rice Husk and Saw Dust for Oxidative Stability of Base Lubricating Oil Using Physico-chemical Properties

Abstract

The thermo-oxidative stability of the mineral base oil (MBO) was examined by subjecting it to artificial aging process performed at different temperatures (25, 50, 100, 150, and 200°C) and times (00-24 h in cycles of 06 h). The MBO samples additized with the antioxidants under study were then oxidized under the optimized temperatures and time. The antioxidants were used in concentration range of 1-3 % (w/w). The extent of the degradation was estimated from the changes in the physico-chemical properties i.e. kinematic viscosity determined at 40 and 100°C, viscosity index, viscosity ratio, Conradson carbon residue, total acid number and iodine number in comparison with the un-oxidized plain oil. The results inferred that the antioxidants used in concentration of 3 % proved to be effective in avoiding the thermo-oxidative degradation of the MBO.